– 4 –
Component Checks at Main Board ............................................................................................................................... 29
Service Main Board .........................................................................................................................................................................30
Service Main Board .............................................................................................................................................................. 30
User Interface ...................................................................................................................................................................................31
Components ...................................................................................................................................................................................... 32
Louvers ...................................................................................................................................................................................... 32
Thermistors Indoor ............................................................................................................................................................... 34
Thermistors Outdoor ........................................................................................................................................................... 34
Indoor Fan Motor .................................................................................................................................................................. 35
Indoor Blower Wheel ........................................................................................................................................................... 35
End Cap and Indoor Fan Blower Bearing .................................................................................................................. 36
Outdoor Fan Motor Shroud .............................................................................................................................................. 37
Outdoor Fan Motor............................................................................................................................................................... 38
Heater ........................................................................................................................................................................................ 39
Power Cords ............................................................................................................................................................................ 40
ICR System ............................................................................................................................................................................... 40
Damper Door .......................................................................................................................................................................... 41
Make Up Air Module ............................................................................................................................................................. 41
Sealed System ........................................................................................................................................................................ 43
Sealed System Heat Pump ............................................................................................................................................... 44
Compressor Check - Wiring ............................................................................................................................................. 44
Sealed System Heat Pump Components ................................................................................................................... 44
Sealed System Common ................................................................................................................................................... 45
Electrical .................................................................................................................................................................................... 46
Low Voltage Transformer ................................................................................................................................................. 47
Condensate Removal .......................................................................................................................................................... 48
Fault Codes.........................................................................................................................................................................................49
Service Mode .....................................................................................................................................................................................52
Sealed System – Refrigerant Flow Cooling ..........................................................................................................................53
Sealed System – Refrigerant Flow Heating .........................................................................................................................54
Recovery Process ............................................................................................................................................................................55
Charging Summary ........................................................................................................................................................................ 56
Schematic/Wiring Diagram ........................................................................................................................................................57
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